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Simplifying 21 = (2r) * 3.14 Remove parenthesis around (2r) 21 = 2r * 3.14 Reorder the terms for easier multiplication: 21 = 2 * 3.14r Multiply 2 * 3.14 21 = 6.28r Solving 21 = 6.28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28r' to each side of the equation. 21 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 21 + -6.28r = 0.00 Add '-21' to each side of the equation. 21 + -21 + -6.28r = 0.00 + -21 Combine like terms: 21 + -21 = 0 0 + -6.28r = 0.00 + -21 -6.28r = 0.00 + -21 Combine like terms: 0.00 + -21 = -21 -6.28r = -21 Divide each side by '-6.28'. r = 3.343949045 Simplifying r = 3.343949045
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